CN217323881U

CN217323881U - Special optical fiber drawing device

Info

Publication number: CN217323881U
Application number: CN202220526102.7U
Authority: CN
Inventors: 黄勇; 宋静波; 彭耐
Original assignee: Comcore Optical Intelligence Technologies Co ltd
Current assignee: Comcore Optical Intelligence Technologies Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-08-30
Anticipated expiration: 2032-03-11

Abstract

The invention belongs to the technical field of special optical fiber drawing, and particularly relates to a special optical fiber drawing device which comprises a first optical fiber drawing mechanism and a second optical fiber drawing mechanism, and further comprises a first guide roller, a second guide roller, a twisting component, a guide wire hook, a winch, a guide wheel and a winding disc, wherein the first optical fiber drawing mechanism and the second optical fiber drawing mechanism are respectively used for drawing a prepared optical fiber perform into a first optical fiber bare wire and a second optical fiber bare wire after being heated and melted by heating equipment. According to the invention, two groups of optical fiber drawing mechanisms are designed to simultaneously draw wires, and the two drawn bare single-fiber wires are twisted and plied to form the composite optical fiber which has a certain twist and has a double-bare-wire cross-twisted spiral structure, so that the mechanical strength of the optical fiber is further improved, the optical fiber preform is not required to be subjected to rotary drawing, and the problem that the heating end of the preform is easy to generate an eccentric phenomenon in a rotary state, so that the drawing cannot be continued is solved.

Description

Special optical fiber drawing device

Technical Field

The invention relates to the technical field of special optical fiber drawing, in particular to a special optical fiber drawing device.

Background

The spiral high-birefringence structure polarization maintaining fiber (called as polarization maintaining fiber for short) is a core material of a fiber current sensor based on an optical Faraday effect, and the cross section structure of the fiber is similar to that of a polarization maintaining fiber, such as panda type, collar junction type, elliptical cladding type, elliptical core, straight type and the like.

From the structure, the biggest difference between the polarization maintaining elliptical fiber and the polarization maintaining fiber is as follows: the linear birefringence orientation in a polarization maintaining fiber is constant or very slowly varying with transmission distance (or fiber axis), the slow variation being caused by the fiber drawing process, which is not intended to be so, and is usually negligible; while the orientation of linear birefringence in an elliptically polarizing fiber is rapidly changing with transmission distance (or fiber axis), meaning a helical structure, the period of such change (referred to as the pitch) is typically less than 6 mm.

The existing special optical fiber with a spiral structure needs to be drawn by driving an optical fiber preform to rotate or driving a winding disc to rotate. However, in practical application, the heating end of the prefabricated rod is easy to generate eccentricity in a rotating state, so that drawing cannot be continued, and the optical fiber prefabricated rod has unstable parameters of a bare optical fiber wire during rotating drawing, low mechanical strength and extremely limited drawing length.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a special optical fiber drawing device, which solves the problems that the heating end of a prefabricated rod in the existing special optical fiber drawing device is easy to generate eccentricity in a rotating state, so that the optical fiber bare wire parameters are unstable, the mechanical strength is lower and the drawing length is extremely limited when the optical fiber prefabricated rod is subjected to rotary drawing in a drawing process.

(II) technical scheme

The invention specifically adopts the following technical scheme for realizing the purpose:

the special optical fiber drawing device comprises a first optical fiber drawing mechanism and a second optical fiber drawing mechanism, and further comprises a first guide roller, a second guide roller, a twisting part, a guide wire hook, a winch, a guide wheel and a winding disc, wherein the first optical fiber drawing mechanism and the second optical fiber drawing mechanism are respectively used for drawing a prepared optical fiber preform into a first bare optical fiber wire and a second bare optical fiber wire after being heated and melted by heating equipment, the first bare optical fiber wire and the second bare optical fiber wire are respectively fed into the twisting part through the first guide roller and the second guide roller for twisting, the first bare optical fiber wire and the second bare optical fiber wire are drawn to the guide wire hook after being twisted to be stranded into a composite optical fiber with a spiral structure, and the composite optical fiber is guided to the winding disc through the winch and the guide wheel to finish the drawing.

Further, the first optical fiber drawing mechanism and the second optical fiber drawing mechanism respectively comprise an optical fiber preform rod, a heating furnace, a laser diameter measuring instrument, a cooling mechanism and a resin coating device, the laser diameter measuring instrument, the cooling mechanism and the resin coating device are sequentially arranged on a wire drawing path between a wire drawing outlet of the heating furnace and the first guide roller, the laser diameter measuring instrument is used for measuring the diameter of the bare optical fiber, the cooling mechanism is used for cooling the bare optical fiber, and the resin coating device is used for coating a layer of liquid coating on the outer surface of the bare optical fiber.

Further, the liquid coating comprises an inner layer and an outer layer, wherein the inner layer is made of a thermosetting silicone resin liquid coating, and the outer layer is made of an ultraviolet curing acrylate liquid coating or a polyurethane coating.

Furthermore, the twisting part consists of a front roller and a rubbing roller.

(III) advantageous effects

Compared with the prior art, the invention provides a special optical fiber drawing device which has the following beneficial effects:

according to the invention, two groups of optical fiber drawing mechanisms are designed to simultaneously draw wires, and the two drawn bare single-fiber wires are twisted and plied to form the composite optical fiber which has a certain twist and has a double-bare-wire cross-twisted spiral structure, so that the mechanical strength of the optical fiber is further improved, the optical fiber preform is not required to be subjected to rotary drawing, the problem that the heating end of the preform is easy to generate eccentricity in a rotating state, and the drawing cannot be continued is solved, the drawing length of the optical fiber is effectively prolonged, the optical fiber is not easy to break, and the stable drawing of the special optical fiber is realized.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a first optical fiber drawing mechanism according to the present invention.

In the figure: 1. a first guide roller; 2. a second guide roller; 3. a twisting member; 4. a guide wire hook; 5. a winch; 6. a guide wheel; 7. a winding disc; 8. a first bare optical fiber; 9. a second bare optical fiber; 10. a composite optical fiber; 11. heating furnace; 12. a laser diameter gauge; 13. a cooling mechanism; 14. a resin coating device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

As shown in fig. 1-2, a special optical fiber drawing apparatus according to an embodiment of the present invention includes a first optical fiber drawing mechanism and a second optical fiber drawing mechanism, and further includes a first guide roller 1, a second guide roller 2, a twisting member 3, a guide wire hook 4, a capstan 5, a guide wheel 6, and a winding disc 7, wherein the first optical fiber drawing mechanism and the second optical fiber drawing mechanism are respectively used for drawing a prepared optical fiber preform into a first bare optical fiber 8 and a second bare optical fiber 9 after being heated and melted by a heating device, the first bare optical fiber 8 and the second bare optical fiber 9 are twisted in the twisting member 3 through the first guide roller 1 and the second guide roller 2, the first bare optical fiber 8 and the second bare optical fiber 9 are twisted and stranded on the guide wire hook 4 to form a composite optical fiber 10 having a spiral structure, and the composite optical fiber 10 is drawn through the capstan 5, the second optical fiber drawing mechanism, The guide wheel 6 is guided to the winding disc 7 to complete yarn winding; during specific drawing, the first optical fiber drawing mechanism and the second optical fiber drawing mechanism simultaneously draw optical fibers to respectively draw a first bare optical fiber wire 8 and a second bare optical fiber wire 9, the first bare optical fiber wire 8 and the second bare optical fiber wire 9 are guided to the second guide roller 2 through the first guide roller 1, the first bare optical fiber wire 8 and the second bare optical fiber wire 9 guided by the second guide roller 2 keep a certain distance on the twisting component 3, the output two bare optical fiber strands enable a single bare optical fiber to have a small amount of twist due to the transmission of the twist, and the two bare optical fibers are further twisted and plied into a whole after being converged to form the optical fiber with a spiral structure.

As shown in fig. 2, in some embodiments, the first optical fiber drawing mechanism and the second optical fiber drawing mechanism each include an optical fiber preform, a heating furnace 11, a laser diameter gauge 12, a cooling mechanism 13, and a resin coating device 14, the laser diameter gauge 12, the cooling mechanism 13, and the resin coating device 14 are sequentially disposed on a drawing path between a drawing outlet of the heating furnace 11 and the first guide roller 1, the laser diameter gauge 12 is used for measuring the diameter of a bare optical fiber, the cooling mechanism 13 is used for cooling the bare optical fiber, and the resin coating device 14 is used for coating a liquid coating on the outer surface of the bare optical fiber; the optical fiber drawing is a process operation process of heating and melting a prepared optical fiber preform by using certain heating equipment, drawing the optical fiber preform into a fine optical fiber with the diameter meeting the requirement, and ensuring that the core/package diameter ratio and the refractive index distribution form of the optical fiber are unchanged. The invention carries out optical fiber drawing through a first optical fiber drawing mechanism and a second optical fiber drawing mechanism, and the specific process comprises the following steps: melting a prefabricated optical fiber preform by using a heating furnace 11, drawing a corresponding first bare optical fiber wire 8 and a corresponding second bare optical fiber wire 9, then performing diameter detection on the first bare optical fiber wire 8 and the second bare optical fiber wire 9 by using a laser diameter measuring instrument 12 so as to accurately control the outer diameter of a core/cladding, cooling the drawn bare wires by using a cooling mechanism 13 in a slow cooling mode, and then coating a layer of coating material with higher elastic modulus on the surface of the cooled bare fibers by using a resin coating device 14 so as to protect the surface of the drawn optical fibers from being damaged, improve the mechanical strength of the drawn optical fibers and reduce the attenuation; and finally, the two bare fibers are respectively guided to the twisting part 3 through the first guide roller 1 and the second guide roller 2 to be twisted.

In some embodiments, the liquid coating covering comprises an inner layer and an outer layer, the inner layer is a thermosetting silicone resin liquid coating, and the outer layer is an ultraviolet light curing acrylate liquid coating or polyurethane coating; the thermosetting silicone resin liquid coating has excellent heat resistance, chemical stability, electrical insulation and hydrophobicity, so the coating is adopted as an inner layer to be coated on the surface of an optical fiber, the heat resistance, the electrical insulation and the chemical stability of the optical fiber are enhanced, the ultraviolet light curing acrylate liquid coating has the advantages of high curing speed, low energy consumption, low pollution and the like, the heat resistance, the corrosion resistance and the weather resistance are good, the excellent outer layer protection can be provided, the wear resistance and the chemical corrosion resistance of the optical fiber can be improved by the polyurethane coating, and the polyurethane coating is preferably selected as the outer layer.

In some embodiments, the twisting component 3 is composed of a front roller and a rubbing roller; when the double-fiber bare wire is used, the front roller plays a role in drafting and twisting, the two bare wires are output by the front roller, a small amount of twist is carried on the single bare wire due to the transmission of the twist, the single bare wire is further twisted by the twisting roller and is converged, twisted and stranded at the guide wire hook 4 to form the composite fiber 10, the double-fiber bare wire has certain viscosity and integrally forms a cross-twisting structure, the mechanical strength of the optical fiber bare wire is greatly improved, the optical fiber drawing length is effectively prolonged, and the optical fiber drawing length is not easy to break.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The special optical fiber drawing device comprises a first optical fiber drawing mechanism and a second optical fiber drawing mechanism, and is characterized in that: the special optical fiber drawing device further comprises a first guide roller (1), a second guide roller (2), a twisting part (3), a guide wire hook (4), a winch (5), a guide wheel (6) and a winding disc (7), wherein the first optical fiber drawing mechanism and the second optical fiber drawing mechanism are respectively used for drawing a prepared optical fiber preform into a first bare optical fiber wire (8) and a second bare optical fiber wire (9) after being heated and melted by heating equipment, the first bare optical fiber wire (8) and the second bare optical fiber wire (9) are respectively guided by the first guide roller (1) and the second guide roller (2) to the twisting part (3) for twisting, the first bare optical fiber wire (8) and the second bare optical fiber wire (9) are drawn to the guide wire hook (4) after being twisted to be stranded into a composite optical fiber (10) with a spiral structure, and the composite optical fiber (10) is drawn to the guide wire hook (4) through the winch (5), The guide wheel (6) is guided to the winding disc (7) to complete the yarn take-up.

2. The specialty optical fiber drawing apparatus of claim 1, wherein: the first optical fiber drawing mechanism and the second optical fiber drawing mechanism respectively comprise an optical fiber preform rod, a heating furnace (11), a laser diameter measuring instrument (12), a cooling mechanism (13) and a resin coating device (14), the laser diameter measuring instrument (12), the cooling mechanism (13) and the resin coating device (14) are sequentially arranged on a wire drawing path between a wire drawing outlet of the heating furnace (11) and a first guide roller (1), the laser diameter measuring instrument (12) is used for measuring the diameter of a bare optical fiber wire, the cooling mechanism (13) is used for cooling the bare optical fiber wire, and the resin coating device (14) is used for coating a layer of liquid coating on the outer surface of the bare optical fiber wire.

3. The specialty optical fiber drawing apparatus of claim 2, wherein: the liquid coating layer comprises an inner layer and an outer layer, the inner layer is made of thermosetting silicone resin liquid coating, and the outer layer is made of ultraviolet curing acrylate liquid coating or polyurethane coating.

4. The specialty optical fiber drawing apparatus of claim 1, wherein: the twisting component (3) consists of a front roller and a rubbing roller.